Which statements describe a seismograph? check all that apply.
a. it has a curved graphing surface.
b. it is used to locate an earthquake's epicenter.
c. it uses a needle on a graph paper to measure seismic wave activity.
d. it determines the arrival of p wave.
e. it measures data used to find the difference between the arrival times of surface waves.

Options (A), (B), and (D)

Explanation:

Seismographs are the instruments that are used to determine the magnitude, force, and epicenter of an earthquake. It is commonly used by seismologists. It is comprised of a block (heavy-weight) that is held by a wire and below the weight, there uses a pen that records the amount of disturbance (data) on a curved surface of a graph during the time of occurrence of an earthquake. These data help in deriving the arrival of the P and S waves that enables seismologists or geologists to determine its epicenter.

Thus, the correct answers are options (A), (B), and (D).

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